Washington Post
"Pickups line the highway as the townsfolk come on over to observe Ray round off the pitcher's mound, pour the lines of lime, mount floodlights and bleachers."

In dictionaries, I could find "come on" and "come over to", but not "come on over to". What does "come on over to" mean?
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Comments  (Page 2) 

I think it would be advantageous to you that you don't continue making authoritative and challenging statements if your main interest is to learn from the natives and those who have the knowledge be it here, or anywhere else. "Came on over ..." is correct, as well as just "came over" but the former is more appropriate. In the context of the book, Raymond and the author went down to the pier swimming and the author narrating in every detail on that scorching day clearly expressed his thoughts and more importantly his view which was, Marcie "came on over to the pier.... ". "Came on over.." carried a tone of invitation, and even expectation which was reasonable.

O na different context, If I have a few friends at my place watching the Super Bowl; you happened to call and I cordially invited you. I said " If you are not doing anything, come on over and join us...it will be fun". " Come on over.." is perfectly suited.
But nobody, tell her to "come on" or otherwise encourage her.
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I think you may be taking MM's use of "encoragement" a bit too literally. The expression is just an informal invitation or, in the case or your example, an informal way to say that people were arriving at some destination, or that someone has arrived at some destination--example: "she came on over last night."

The use of "on" is almost always optional.
So, "come on over" is an informal/slang version of "come over"?
MeggPhaggSiouxSo, "come on over" is an informal/slang version of "come over"?
I hesitate to make a blanket statement like that. As you know there are almost always exceptions and special situations that can change how something is used or understood.

Still, in general, I'd say that "come over" and "come on over" can usually be used as synonyms.
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